<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var a = 1;

        function fn1() {
            a++;
            console.log(a)
        }

        function fn2() {
            a++;
            console.log(a)
        }
        fn1();
        fn2();
    </script>
</body>

</html>